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java 打印等腰三角形可以采用如下方式：
public class Mul {public static void main(String args[]) {
for (int i = 1 i <= 6 i++) {
// 空格分布
for (int j = 6 - i j > 0 j--) {
System.out.print(" ")
}
// 符号分布
for (int j = 1 j <= i j++) {
System.out.print("* ")
}
System.out.println()
}
}
}
效果如下：
public static void main(String[] args) {int n = 5
String c = "0"
String x = "*"
for (int i = 0 i < n i++) {
for (int k = 0 k < n - i - 1 k++) {
System.out.print(c)
}
for (int k = 0 k < i + 1 k++) {
System.out.print(x)
}
for (int k = 0 k < i k++) {
System.out.print(x)
}
/**
* 一下注释掉的代码属于多余的代码，本程序只需要分成三块实现
*/
// for (int k = 0 k < n - i - 1 k++) {
// System.out.print(c)
// }
System.out.println()
}
}
2、空心等边三角形参考代码如下：
public static void main(String[] args) {int n = 6
String c = " "
String x = "*"
for (int i = 0 i < n i++) {
for (int j = 0 j < 2 * n j++) {
if (j == (n - i) || j == (n + i)) {
System.out.print(x)
} else {
System.out.print(c)
}
}
System.out.println()
}
for(int j=0j<2*(n+1)-1j++){
System.out.print(x)
}
}
窗口的（Swing）就相对容易一些，只要你找到三个点的坐标就可以通过API画出来
而控制台版就通过打点，打空格来打到画出等腰三角形；
public class DrawTriangleTest extends JFrame {private Point top
private Point bottom1
private Point bottom2
public static void main(String[] args) {
new DrawTriangleTest()//swing版的三角形
//下面是控制台版的三角形
//-----------------------
int n = 10
String c = "\t" //分隔符
String x = "\t*" //打点
for (int i = 0 i < n i++) {
for (int j = 0 j < 2 * n j++) {
if (j == (n - i) || j == (n + i)) {
System.out.print(x)
} else {
System.out.print(c)
}
}
System.out.println()
}
for(int j=0j<2*(n+1)-1j++){
System.out.print(x)
}
//-----------------------
}
public DrawTriangleTest() {
init()
}
public void init() {
this.setSize(new Dimension(300, 300))
this.setLocationRelativeTo(null)
this.setDefaultCloseOperation(3)
this.setVisible(true)
drawTrinagle(100, 150)
}
public void drawTrinagle(int h, int w) {
int bx = (int) ((this.getWidth() - w) / 2.0)// 低端左边点的x
int ty = (int) ((this.getHeight() - h) / 2.0)//
top = new Point(this.getWidth() / 2, ty)// 定点
bottom1 = new Point(bx, ty + h)// 左下角的点
bottom2 = new Point(bx + w, ty + h)// 右下角的点
this.repaint()
}
@Override
public void paint(Graphics g) {
super.paint(g)
if (top != null && bottom1 != null && bottom2 != null) {
g.drawLine(bottom1.x, bottom1.y, bottom2.x, bottom2.y)// 底下那条线
g.drawLine(top.x, top.y, bottom2.x, bottom2.y)// 左边的腰
g.drawLine(bottom1.x, bottom1.y, top.x, top.y)// 右边的腰
}
}
}
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